Matthew keenan



M. KEENAN.

BOILER COVERING.

(No Model.)

FIG: I Patented Dec. 1, 1885.

UNITED STATES PATENT OFFICE,

MATTHEWV KEENAN, OF ARMAGH WORKS, TREDEGAR ROAD, NORTH BOW, OOUN TY OF MIDDLESEX, ENGLAND.

BOILER-COVERING.

SPECIFICATION forming part of Letters Patent No. 331,409, dated December 1,1885. Application filed June 25, 1885. Serial No. 169,903. (No model.) Patented in England April 16, 1885, No. 4,711.

To all whom it may concern.-

Be it known that I, MATTHEW KEENAN, a subject of the Queen of Great Britain, residing at Armagh Works, Tredegar Road, North Bow, in the county of Middlesex, England, have invented a certain new and and useful Improvement in Boiler-Coverings, of which the following is a specification.

The principal object of this invention is to produce a portable and easily-applicable non-conducting covering for boilers, pipes, and other objects, which covering consists of sheets of a non-conducting material or composition or layers of such materials or compositions.

The sheets are made so as to be conveniently applied and removed for inspection and repair, and they may be made flat or bent, and of any desired surface, shape, and size. For boilers, pipes, and other cylindrical objects, I may make each of said sheets to extend around one-half or one-fourth of the circumference of the article to be covered.

In the drawings, Figure 1 is a perspective view, sectionally, showing the sheets applied as a covering to the upper part of a Cornish boiler. Fig. 2 is a perspective view, sectionally,showing a pipe covered with said sheets; and Fig. 3 is an enlarged sectional View of a portion of the covering and boiler.

A is a thin outer metal shell over the sheets.

B are the angle-iron ribs,to which the composition sheets E and shell A are riveted, as

shown in Fig. 1, or attached by screws 0, as

shown in Fig. 2.

The depth of the ribs B determines the distance of the sheets E from the shell of the pipe or boiler, and also regulates the size of the air-chamber D, which I prefer to form between said sheets and the shell of the boiler or pipe. I prefer to make the aforesaid sheets of a layer or layers of hair, felt, or hair prepared or lined on the inside, next to the boiler,with a layer of a composition made from certain materials which serve to enable the hair or felt to withstand high temperatures. These materials are pulped vegetables--such as, turnips and beets-cornbined with sulphate of magnesium, (Epsom salts,) to which are added small quantities of sulphate of lime,(manufactured from clay, earth, and chalk,) vegetable size, vegetable black or spirit black, Stockholm tar, or other suitable hydrocarbon liquid, raw linseed-oil or cottonoil, and paper-pulp. These materials are well mixed together in such proportions as will be necessary to meet the varying require ments and temperatures, and are then laid on or soaked through the felt or hair. The following proportions are suitable: fifty parts, by Weight, of pulped turnips, thirty parts of sulphate of magnesium, ten parts of sulphate of lime, two and one-ha1f parts of vegetable or spirit black, two and one-half parts of paperpulp, two parts oil, two parts of Stockholm tar, one-half part of vegetable size, and onehalf part hair.

In order to make the hair or felt of the sheets E adhere to the sheet-metal shell A, I use a cement or composition consisting mainly or wholly of white and red lead, ground chalk, zinc-white, and raw or boiled linseedoil, all mixed together in a paint or putty consistency. These sheets may be applied direct to the surface to be protected against radiation; but. I prefer to use a wrought or cast iron skeleton frame of angle, T, or bar iron upon the exterior of the boiler or other surface and affix the segment sheets to such skeleton frame by means of screws or bands, as hereinbefore described, and I prefer to form an intermediate air-chamber between the sheet and the boiler or other surface to be protected against radiation. Sheets thus applied are easily removable when inspection or repair of the boiler or other object is required, and said sheets form an article of commerce easily applied, transported, and removed.

I claim as my inventionl. The non-conducting material for protecting boilers and other articles, consisting of pulped turnips, sulphate of magnesium, sulphate of lime, vegetable black or spirit black, paper-pulp, oil, Stockholm tar, and vegetable size, in about the proportions stated, and for cemented to the inside of a metallic sheet, sub- [0 the purposes set forth. stantially as set forth.

2. The non-conducting material for protecting boilers and other articles, consisting of MATTHFIXV KEENAN' hair, felt, and a composition consisting of Witnesses:

pulped turnips, sulphate of magnesium, sul- HERBERT E. DALE, phate of lime, vegetable black or spirit black, 17 Gracechurch St, London, E. O. paper-pulp, oil, Stockholm tar, and vegetable WALTER J AMES SKERTEN,

size, all about in the proportions stated, and 17 Gracechurch St, London. 

